Jim Hearne
Member
- Messages
- 6
Hi, anybody know of a cause for intermittent porous weld on mild steel ?
Using an Sealy HF170 welder.
Sometimes it welds fine and other times it starts fizzing and the weld fills with little bubbles, often when you stop the weld then forms a volcano as it sets.
The more you try to fill the holes the worse it gets.
The metal is clean (with angle grinder), and theres plenty of the correct gas.
Could i be overheating the weld pool ?, can that happen ?
I've got it on the lowest current setting that seems to weld ok, tonight butt welding 6mm steel to 3mm steel at 100 amps and 1.5mm tube to the 3mm at 80 amps. Most of the tube weld was ok but the 3 to 6 went quite porous.
Welding stainless i get no problems at all.
Any ideas,
Many thanks,
Jim Hearne
Using an Sealy HF170 welder.
Sometimes it welds fine and other times it starts fizzing and the weld fills with little bubbles, often when you stop the weld then forms a volcano as it sets.
The more you try to fill the holes the worse it gets.
The metal is clean (with angle grinder), and theres plenty of the correct gas.
Could i be overheating the weld pool ?, can that happen ?
I've got it on the lowest current setting that seems to weld ok, tonight butt welding 6mm steel to 3mm steel at 100 amps and 1.5mm tube to the 3mm at 80 amps. Most of the tube weld was ok but the 3 to 6 went quite porous.
Welding stainless i get no problems at all.
Any ideas,
Many thanks,
Jim Hearne